Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B61—RAILWAYS
  • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
  • B61L3/00—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal
  • B61L3/02—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control
  • B61L3/08—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically
  • B61L3/12—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically using magnetic or electrostatic induction; using radio waves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B61—RAILWAYS
  • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
  • B61L3/00—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal
  • B61L3/02—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control
  • B61L3/08—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically
  • B61L3/12—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically using magnetic or electrostatic induction; using radio waves
  • B61L3/121—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically using magnetic or electrostatic induction; using radio waves using magnetic induction
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B61—RAILWAYS
  • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
  • B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor

Definitions

• a traffic control system use of it, and a method of controlling the movement of a mobile unit
• the invention concerns a traffic control system of the type defined in the introductory portion of claim 1, and the use of such a system in connection with train traffic.
• the invention moreover concerns a use and a method of con ⁇ trolling the movement of a mobile unit, said method being of the type defined in the introductory portion of claim 11.
• EP-A-145 464 discloses a train control system wherein transponders, applying a coded response to an inquiry, are located along the track. A train receives information on the code of the next transponder from a control centre, and the train reports when this code has been detected. If the transponder is not detected, the train is brought to a standstill.
• GB-A-2 219 833 discloses a traffic information system for use in bus traffic.
• a transmitter is provided at each bus stop, transmitting a code to a bus when interrogated, whereby the position of the bus may be determined. This information may be used e.g. in traffic control centres for putting on more buses if necessary.
• US 5 129 605 discloses a system wherein a plurality of different position determination systems are used for determining the exact position of a train. The whole is controlled by a control centre which coordinates the in ⁇ formation. Furthermore, a safety system called automatic train con ⁇ trol (ATC) has been developed for the purpose of improving train safety.
• ATC automatic train con ⁇ trol
• This system protects against a number of human errors on the part of the train drivers, one of the basics of the system being that the train is provided with a computer which receives traffic information, such as stop signals and speed limits, from a plurality of trans ⁇ mitters along the track. Thus, the computer may bring the train to a standstill irrespective of what the train driver does when the train arrives at a stop signal.
• the signals and the transmitters are controlled from a central signalling post.
• the object of the invention is to provide a system making it possible to control a mobile unit, such as a train, which can take place without interference from a traffic control centre as long as the flow of traffic is smooth.
• the traffic control system is provided with the constructive features defined in the characterizing portion of claim 1.
• the use of stationary, passive units arranged along a track obviates the need for running cables along the track. Thus, it is easy to encap ⁇ sulate the stationary units so as to avoid ingress of water.
• the system is thus extremely insensitive to wind and weather.
• the stationary units apply a unique code to an interrogation, and the computer of a mobile unit can determine its position, the positions of the stationary units, following mounting, being determined exactly and stored Electronically.
• the mobile unit can hereby deter ⁇ mine its position on the basis of the unique code by an electronic look-up table.
• the mobile unit simultaneously receives traffic information, such as speed limits and data concerning the last-passed train on the point con- cerned of the section. It is hereby possible to control the speed pilot of the train by data obtained directly from the stationary unit. As mentioned, the traffic infor ⁇ mation may also include information concerning the last- passed train, it being hereby possible to estimate the distance to the preceding train and to determine the dis- tance to it. The movement of the train or the mobile unit may thus be adjusted according to this information.
• traffic information such as speed limits and data concerning the last-passed train on the point con- cerned of the section. It is hereby possible to control the speed pilot of the train by data obtained directly from the stationary unit.
• the traffic infor ⁇ mation may also include information concerning the last- passed train, it being hereby possible to estimate the distance to the preceding train and to determine the dis- tance to it. The movement of the train or the mobile unit may thus be adjusted according to this information.
• This train control may be made additionally safe in that the trains automatically transmit the message to a central control unit, if they no longer keep an expected time- table, so that subsequent trains can calculate more safely whether the section ahead is unoccupied by combining data obtained from the stationary units with data concerning anomaly for a train ahead.
• the stationary units are tags which transmit and receive at low frequencies, preferably at 27 MHz.
• the tags may hereby be buried and thus concealed and protected against wind and weather.
• the stationary units are constructed as stated in claim 3, it is possible to produce a very inexpensive and practically maintenance-free traffic control system, be ⁇ cause the circuits are powered by the electromagnetic energy released by the mobile units through their interro- gation signal.
• the mobile units may store traffic information in the stationary units, and these traffic messages may consist of the interrogation time of the mo- bile unit and identity information concerning the mobile unit, as stated in claim 5. These data are communicated to the next unit and are then erased, since they are no longer of interest.
• the traffic mes ⁇ sages may comprise speed limits and information on local conditions, and this information may be a warning of work along the track, etc.
• the calculated position information may be displayed on a display, the information being re ⁇ presented either by numerical values or as a graphic in ⁇ dication on a map.
• control unit of the mobile unit calculates the distance to the last-passed mobile unit - optionally in time - which takes place on the basis of the received traffic messages from the stationary units and optionally from a traffic control centre if the last- passed unit does not keep a predetermined timetable.
• the traffic control system defined in claims 1-10 may be used in connection with a large number of mobile units, and these follow a more or less predetermined route. This may e.g. be taxiing of aircraft in airports, where the pilot himself can taxi the aircraft to a gate, and the control tower does not have to interfere as long as there is no other aircraft along the route concerned.
• the system can be used in connection with public bus traffic, since a computer incorporated in a bus can transmit information to a traffic control centre if the bus does not keep the timetable. The traffic control centre can then display the expected changed arrivals at subsequent bus stops. The passengers will hereby be kept currently informed of the expected arrival of the next bus.
• the system finds particular application within traffic control sys- tems in connection with railway traffic as stated in claim 11.
• the train driver can drive the train without interference from the traffic control center as long as the established timetable is kept.
• the train drivers are no longer referred to visual signals along the track, but can drive the train on the basis of their knowledge of the position of the train and the knowledge of the position of the last-passed train. This opens up the prospect of in ⁇ troducing driver-less trains, where the computer of the train controls its movements.
• the invention also concerns a method which is distinguished by the subject-matter de ⁇ fined in claim 12.
• fig. 1 schematically shows the control system of the in ⁇ vention in connection with a train
• fig. 2 shows in plan view how the control system of the train communicates with a stationary unit through an in ⁇ ductive coupling by means of frame aerial;
• fig. 3 schematically illustrates the communication between the computer of the locomotive and a stationary unit and a traffic control centre
• fig. 4 schematically shows the structure of a stationary unit
• fig. 5 shows how the information may be protocolized with an interrogation and a subsequent reply in a traffic con ⁇ trol system according to the invention
• fig. 6 shows how the interrogation may be designed, when simultaneously storing data of a more permanent nature.
• the traffic control system of the invention is shown in fig. 1 and is implemented in the shown embodiment in a train 1 travelling on rails 2.
• Stationary units 3 or tags are provided along the track, said tags preferably operat ⁇ ing at 27 MHz, so that they lend themselves to being buried, e.g. along a track, without interfering with the transmission and reception conditions of these tags.
• the stationary units 3, which are shown in greater detail in fig. 4, all contain a predetermined identification code. These stationary units are provided along the track at a predetermined distance of e.g. 100 meters or 500 meters, and the positions of the stationary units are subsequently determined very precisely, and the position of the unit is stored together with the information code as a table in an electronic store.
• the stationary unit 3 contains information con ⁇ cerning speed limits, such information may be used via the computer 12 for controlling the maximum speed of a traffic pilot 13. Further, the computer 12 can calculate the dis ⁇ tance to the last-passed mobile unit, which can be shown on a display 14 together with various relevant items of information, such as the actual speed of the train, the time and the previously calculated position; the latter may be shown either in an alphanumeric representation or as a graphic representation on a map or a map segment.
• the train driver may also communicate with the computer 12 through a driver interface 19 in the form of a keyboard.
• the computer is moreover connected to a unit 11 from which driving-technical data are obtained. It is thus here that the computer receives information on the actual speed of the train.
• the computer 12 is finally connected to a unit 13 from which it receives information on driving-technical initiatives, i.e. activation of brakes, activation of throttle control, etc. It is noted that two-way communication is involved, so that the computer 12 receives information on driving-technical initiatives, but can also take over the control from the train driver, if, owing to the received information, the computer detects a situation where such interference is required.
• driving-technical initiatives i.e. activation of brakes, activation of throttle control, etc.
• the computer 12 is in radio communication with a traffic control centre 15, which takes place via a transmitter/receiver 18 with associated aerial.
• the com ⁇ puter 12 currently receives relevant information via this radio connection, and this information comprises time ad ⁇ justments, the passage points of time of the system being currently stored in the stationary units, so that a cer ⁇ tain precision is required with respect to the points of time.
• the information also comprises current information on other trains, if these do not keep the predetermined timetables, and the amount of deviation involved for these trains timewise. Trains are identified by means of prede ⁇ termined identification codes.
• the centre simultaneously transmits current interrogations to which the computer merely replies OK as long as the timetable is kept. In case of deviations from the timetable beyond permitted tolerances, the computer of the train communicates the amount of these deviations, which is determined by means of the position determination compared with predetermined timetables stored in the store of the computer.
• Fig. 4 shows the stationary unit 3 which, as mentioned before, comprises a frame aerial 4 or coil, which communi ⁇ cates with the control unit 7 or CPU of the stationary unit via a transmitter/receiver interface.
• the control unit 7 is powered from the transmitter/receiver interface, which takes place by means of a rectifier circuit 6 that rectifies the radio signal and supplies a DC voltage to the control unit 7 over its associated stores.
• the control unit 7 has a PROM 9 in which the program sequences neces- sary for the function are stored together with the unique identification code of the control unit.
• the stationary unit moreover has a RAM in which traffic messages are stored. Traffic messages in the form of passage points of time or interrogation points of time and train information are overwritten on previous, corresponding information, while traffic messages of a more permanent nature, such as speed limits and the like, are stored in separate store sections in the RAM 8.
• the communication between a mobile unit 1 and a stationary unit 3 may take place e.g. as shown in fig. 5.
• the mobile unit first gives a password 20 which partly ensures that the unit is allowed to store data in the RAM of the sta ⁇ tionary unit, partly starts the power supply to the sta- tionary unit.
• an information code 21 is given, followed by driving-technical information in the form of interrogation point of time and optionally speed.
• the stationary unit transmits it unique information code 25 by means of which the mobile unit can determine its position by a table look-up. It subsequently transmits traffic messages N
• the last-mentioned permanent data are designated 27.
• Fig. 6 illustrates how data may be composed, if the mobile unit is to be permitted to store data which are of a more permanent nature.
• the data order is by and large the same as above, the mobile unit supplying a password 20, an identification code 21 followed by driving-technical data 22, and then the mobile units supply another password 23 which, if the stationary unit recognizes it, permits the mobile unit to store information of a more permanent na- ture, said information being designated 24 and comprising speed limits and the like, as mentioned above.
• the stationary unit When the stationary unit has recognized these data, it supplies a reply, as shown in connection with fig. 5.
• the invention may moreover be used in connection with taxiing of aircraft in airports, so that the control towers are relieved of this type of job.
• the system opens up the prospect of putting driver-less trains into operation.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Train Traffic Observation, Control, And Security (AREA)
• Traffic Control Systems (AREA)
• Mobile Radio Communication Systems (AREA)

Priority Applications (1)

Applications Claiming Priority (4)

Publications (2)

Family

ID=8100935

Family Applications (1)

Country Status (25)

Families Citing this family (18)

Family Cites Families (12)

• 1995
  • 1995-02-13 TW TW084101267A patent/TW279960B/zh active
  • 1995-09-25 SK SK382-97A patent/SK38297A3/sk unknown
  • 1995-09-25 KR KR1019970701842A patent/KR970706161A/ko not_active Application Discontinuation
  • 1995-09-25 AT AT95931920T patent/ATE179376T1/de not_active IP Right Cessation
  • 1995-09-25 WO PCT/DK1995/000382 patent/WO1996009199A1/en not_active Application Discontinuation
  • 1995-09-25 BR BR9509156A patent/BR9509156A/pt not_active Application Discontinuation
  • 1995-09-25 US US08/809,565 patent/US5924653A/en not_active Expired - Fee Related
  • 1995-09-25 ES ES95931920T patent/ES2131854T3/es not_active Expired - Lifetime
  • 1995-09-25 AU AU35174/95A patent/AU692303B2/en not_active Ceased
  • 1995-09-25 CA CA002200320A patent/CA2200320A1/en not_active Abandoned
  • 1995-09-25 MX MX9702172A patent/MX9702172A/es unknown
  • 1995-09-25 EP EP95931920A patent/EP0782520B1/de not_active Expired - Lifetime
  • 1995-09-25 RO RO97-00590A patent/RO120476B1/ro unknown
  • 1995-09-25 DE DE69509398T patent/DE69509398T2/de not_active Expired - Fee Related
  • 1995-09-25 HU HU9701682A patent/HU220538B1/hu not_active IP Right Cessation
  • 1995-09-25 PL PL95319371A patent/PL178070B1/pl unknown
  • 1995-09-25 JP JP8510542A patent/JPH10505928A/ja active Pending
  • 1995-09-25 AP APAP/P/1997/000946A patent/AP9700946A0/en unknown
  • 1995-09-25 DK DK95931920T patent/DK0782520T3/da active
  • 1995-09-25 NZ NZ292870A patent/NZ292870A/en unknown
• 1997
  • 1997-03-19 BG BG101345A patent/BG101345A/xx unknown
  • 1997-03-21 FI FI971205A patent/FI971205A/fi unknown
  • 1997-03-21 OA OA60980A patent/OA10474A/en unknown
  • 1997-03-21 NO NO971351A patent/NO971351L/no not_active Application Discontinuation
• 1999
  • 1999-06-30 GR GR990401717T patent/GR3030631T3/el unknown

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events